Container for metal tube and extrusion presses



May 14, 1963 H. H. GRoos 3,089,591

TUBE Anp ExTRusIoN PEEssEs United States Patent Office Patente, May ,4, 6,

3,089,591 CQNTAINER FOR METAL TUBE AND EXTRUSION PRESSES Horst Hans Groos, Dusseldorf, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany Filed June 27, 1960, Ser. No. 39,169

Claims priority, application Germany July 11, 1959 5 Claims. (Cl. 207-15) A container for a metal tube and extrusion press is known, in the reception opening of which is inserted a plurality of shaped pieces, Iwhich form a receiving chamber for non-circular billets, an intermediate piece being in each case interposed 'between adjacent ends of two shaped pieces. With these containers, moreover, the intermediate pieces bear on the internal wall surface of the container. There is therefore the disadvantage, amongst others, that extrusion material penetrates into the joints -that sometimes occur between a shaped piece and an intermediate piece, when the billet to be extruded, located in the receiving chamber of the container, is subjected to pressure. With frequent use of such a container it becomes subject, owing to ever increasing quantities of extrusion material that accumulate in the joints, to an ever increasing initial stress, which may finally lead to the bursting of the container.

The present invention obviates this ldisadvantage by the fact that each intermediate piece bears on the internal surfaces of two adjacent shaped pieces, in which case it overlaps the joint between them.

The intermediate pieces exhibit under these circumstances an elasticity which is greater (owing for instance to differences of cross section) than the elasticity of the shaped pieces, so that they bear sealingly on the shaped pieces as soon as the billet to be extruded is subjected to pressure.

In this type of construction the shaped pieces, as in other known methods of construction, are shrunk into the container. In order that by this shrinking-in the intermediate pieces may also be rmly secured, a form of construction appears advantageous in which the intermediate piece projects with a ledge-like extension of dovetail-shaped cross section into the joint, adapted to this form of ledge, in the shaped pieces. If however it is desired to keep the shrinkage forces away from the compartively small intermediate pieces, the construction Iwill then be such that the shaped pieces are in direct Contact with one another, and, in the neighbourhood of the joints, exhibit rounded recesses, in which the intermediate pieces are inserted.

In the case of containers with only two shaped pieces and two intermediate pieces, which together enclose a flat or shallow receiving chamber, the construction is made such that the joints of the shaped pieces are located at the end walls of the receiving chamber.

The reception opening of the container is preferably made non-circular, in order to effect a saving in the breadth of the container. This then yields the possibility that a container according to the invention can be interchanged, in a press, with ordinary containers for circular billets. In order that advantageous bearing surfaces between shaped pieces and the internal wall surface of the container may be yielded in the case of a non-'circular reception opening of the container, the shaped pieces are allowed to bear only in part on the internal wall surface of the reception opening. By this means the introduction of the shaped pieces is also facilitated. It helps to facilitate the introduction in particular if the shaped pieces bear on the wall of the reception opening in the neighbourhood of their joints and in their central portion. It furthermore serves to keep the container narrow, and to save material in the manufacture thereof, if it is given an approximately elliptical cross section, with the minor axis of the ellipse coinciding with the longitudinal axis of the cross section of the receiving chamber.

Instead of an elliptical cross section there may be substituted, without disadvantage, the cross section shown in FIGURES 1 and 2, which is comparatively easy to machine.

Two constructional examples of the invention are diagrammatically illustrated in FIGURES l and 2 of the accompanying drawings.

In both figures the container is denoted by 1. The outline of its cross section is formed of two arcs of circles 21 and two parallel sides 22, thus yielding a narrow ellipse-like form.

In FIGURE 1, into a non-circular and approximately square or rectangular reception opening of the container 1, shaped pieces 3 and `4 are inserted. They enclose a receiving chamber, marked S, for a flat billet. The shaped pieces 3 and 4 are chamfered at 6, on their sides facing the internal wall surface of the container. These thinnings 6 ydiminish the concentrations of stress especially occurring in these regions, and contribute towards the reduction of the bending moments acting upon the container. Moreover by them the insertion of the shaped pieces is facilitated, since the latter bear only partially on the internal wall surface of the reception opening 2, namely at 23 in the neighbourhood of the joints between the shaped pieces and the intermediate pieces, and at 24, that is, at the central portion of each shaped piece.

The shaped pieces 3 and 4 are bevelled on their abutting surfaces, and accommodate here two ledge-like projections 7a, having a dovetail-shaped cross section, on intermediate pieces 7. These intermediate pieces 7, under the extrusion pressure prevailing in the receiving space, press against the inner surfaces of the shaped pieces 3 and 4. If the two shaped pieces 3 and 4 move away from one another under the action of the extrusion pressure, the intermediate pieces 7 always bear tightly against the inner surfaces of the shaped pieces, so that no extrusion material enters the joint between a shaped piece and an intermediate piece. The intermediate piecesl 7, owing to their small cross section, can yield more readily than the shaped pieces 3 and 4. They are shrunk into the container along with the shaped pieces.

In FIGURE 2 the shaped pieces are constructed similarly to those of IFIGURE 1, and are marked 8 and 9. They bear directly against one another with abutting surfaces 10. They are hollowed out, in the region of the joint formed by the abutting surfaces 10, on the side facing the receiving aperture 11, .and they here accommodate resilient intermediate members 12. These are made in the manner of metal collars. They bear tightly, under the action of the extrusion pressure, against the internal wall surface of the shaped pieces. The shaped pieces 8 and 9 are shrunk into the container 1.

This invention yields the following advantages: the

adoption of the shrinking process for the securing of the shaped pieces; the absolute sealing with the help of the intermediate pieces; the simple design of the shaped pieces, which have only a -few operative surfaces and these are easily machinable; the possibility of forming a at receiving chamber with the help of only two shaped pieces; and finally the small breadth of the container, which admits of being fitted into any convenient extrusion press, With containers of the constr-uctions hitherto adopted it was however not possible to give the containers the desired strength, and at the same time such a small breadth that they could be interchanged with ordinary containers for round billets.

I claim:

1. In a container for receiving a billet in an extrusion press, said container including an elongated body having a reception opening therein, a plurality of shaped pieces disposed in said opening in opposed spaced relationship, the inner opposed surfaces of said pieces being -formed with opposed recesses providing top and bottom walls and partial side Walls defining a billet receiving chamber, and intermediate separate filler pieces disposed ybetween said shaped pieces at opposite sides of said chamber, each filler piece having a portion engaging the spaced adjacent inner surfaces of said shaped pieces forming a partial side wall to provide a complete side wall for said chamber and seal the space between said shaped pieces.

2. In a container as defined in claim 1, in which the opposed spaced surfaces of said shaped pieces outwardly of said chamber are provided with a dovetail formation and in which each filler piece is provided with an outwardly extending projection disposed between said shaped pieces and having a dovetail formation `mating with the dovetail formation on said shaped pieces.

3. In a container as defined in claim 1, in which said partial side walls are arcuate and in which said filler pieces have an arcuate outer surface engaging said arcuate partial side walls.

4. in a container as defined in claim 1, in which said reception opening is non-circular in cross-section and in which portions of the outer surfaces of said shaped pieces are removed to provide spaced outer surfaces engaging the inner surface of said reception opening.

5. In a container as defined in claim 4, in which said reception opening is substantially rectangular in crosssection and in which said spaced outer surfaces are disposed adjacent the spaces between said shaped pieces and substantially midway between said partial side walls.

References Cited in the iile of this patent UNITED STATES PATENTS 1,660,491 Leeper Feb, 28, 1928 2,147,879 Burmeister Feb. 2l, 1939 2,283,791 Clark May 19, 1942 2,627,949 Willson Feb. 10, 1953 2,819,517 Pursell Jan. 14, 1958 2,867,321 Swansen Ian. 6, 1959 2,960,221 Albers et al. Nov. 15, 1960 FOREIGN PATENTS 1,051,229 Germany Feb. 26, 1959 

1. IN A CONTAINER FOR RECEIVING A BILLET IN AN EXTRUSION PRESS, SAID CONTAINER INCLUDING AN ELONGATED BODY HAVING A RECEPTION OPENING THEREIN, A PLURALITY OF SHAPED PIECES DISPOSED IN SAID OPENING IN OPPOSED SPACED RELATIONSHIP, THE INNER OPPOSED SURFACES OF SAID PIECES BEING FORMED WITH OPPOSED RECESSES PROVIDING TOP AND BOTTOM WALLS AND PARTIAL SIDE WALLS DEFINING A BILLET RECEIVING CHAMBER, AND INTERMEDIATE SEPARATE FILLER PIECES DISPOSED BETWEEN 